Operating System (OS)
Most of the microcomputer's operating systems like Apple DOS, MS DOS and PC DOS etc. are called disk operating systems because

they are available on magnetic tapes
they are partly in primary memory and partly on disk
they are initially stored on disk
they are memory resident
None of these

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Operating System (OS)
Operating system

enables the programmer to draw a flowchart
All of these
None of these
links a program with the subroutines it references
provides a layered, user-friendly interface

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